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Biodegradation and kinetic analysis of phenol using low-density polyethylene immobilized Bacillus flexus GS1 IIT (BHU) in a packed bed bioreactor
Author : Ganesh Swain, R. K. Sonwani, Pankaj Nagar, B. S. Giri, R. P. Jaiswal, R. S. Singh and B. N. Rai*
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ABSTRACT
Phenol is considered as a precarious pollutant due to its carcinogenic, mutagenic nature even at low concentration. The present study emphasizes the degradation kinetics and behavior of a packed bed bioreactor (PBBR) for biodegradation of phenol using bacterial strain Bacillus flexus GS1 IIT (BHU). Low density polyethylene (LDPE) was used as packing material in a laboratory scale PBBR. Process variables such as pH, temperature were optimized and found to be 7.0 and 30ºC, respectively. Phenol biodegradation efficiency in PBBR was analyzed at optimum condition by varying substrate concentration between 25–700 mg/L. At optimum conditions, the maximum removal of phenol was observed to be 99.45% at 300 mg/L of initial phenol concentration. The kinetic constants were calculated from Monod and Andrew-Haldane model and found to be max: 0.215 h–1; Ks: 80 mg/L and max: 0.27 h–1; Ks: 66 mg/L; Ki: 300 mg/L, respectively.
KEYWORD
PBBR, phenol, kinetic variables, Bacillus flexus, COD removal